Update app.py

app.py

@@ -295,7 +295,7 @@ def demo():
         )
         
         qachain_btn.click(
-            initialize_LLM,
+            initialize_llmchain,  # Fixed function name here
             inputs=[llm_btn, slider_temperature, slider_maxtokens, slider_topk, vector_db],
             outputs=[qa_chain, llm_progress]
         ).then(